CN106685206A - Power-factor correction device and control method thereof and electronic device - Google Patents

Power-factor correction device and control method thereof and electronic device Download PDF

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Publication number
CN106685206A
CN106685206A CN201610792617.0A CN201610792617A CN106685206A CN 106685206 A CN106685206 A CN 106685206A CN 201610792617 A CN201610792617 A CN 201610792617A CN 106685206 A CN106685206 A CN 106685206A
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CN
China
Prior art keywords
switch
current
bridge arm
sampling unit
control
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CN201610792617.0A
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Chinese (zh)
Inventor
梅纯
陈洲
朱方顺
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株式会社村田制作所
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Priority to CN201610792617.0A priority Critical patent/CN106685206A/en
Publication of CN106685206A publication Critical patent/CN106685206A/en

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/42Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208Arrangements for improving power factor of AC input
    • H02M1/4233Arrangements for improving power factor of AC input using a bridge converter consisting of active switches
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/42Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208Arrangements for improving power factor of AC input
    • H02M1/4225Arrangements for improving power factor of AC input using a non-isolated boost converter
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05FSYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/70Regulating power factor; Regulating reactive current or power
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M2001/0003Details of control, feedback and regulation circuits
    • H02M2001/0009Devices and circuits for detecting current in a converter
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00Climate change mitigation technologies for sector-wide applications
    • Y02P80/10Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

Abstract

The invention provides a power-factor correction device and a control method thereof and an electronic device. The power-factor correction device includes a first input terminal and a second input terminal; an output terminal; an inductor whose first end is coupled to the first input terminal; a first bridge arm including a first switch device and a second switch device connected in series and whose first end is coupled to the output terminal and whose second end is in grounded connection directly or indirectly; a second bridge arm whose first end is coupled to the output terminal and whose second end is in grounded connection directly or indirectly; a first current sampling unit configured to at least sampling a falling edge of inductive current flowing through the inductor whose at least one end is in grounded connection in a negative half-cycle of AC input signals so as to obtain a sampling result; and a switch control unit configured to generating switch control signals according to the sampling results so as to control the first switch device and the second switch device to change switching states. The scheme provided by the invention can reduce influence on a circuit by parasitic parameters.

Description

Power factor correcting and its control method and electronic equipment

Technical field

The present invention relates to PFC (PFC) technology, more particularly to a kind of power factor correcting and its control Method and electronic equipment.

Background technology

Power factor (Power Factor, PF) is a kind of parameter for weighing electrical equipment power consumption efficiency.In order to carry High power consumption efficiency, ac input signal is being provided to before electrical equipment, generally all first can carry out work(to ac input signal Rate factor correcting (Power Factor Correction, PFC).Power factor correcting is generally all by reducing voltage Phase contrast and electric current between is improving power factor.

In prior art, a kind of power factor correcting use it is traditional have bridge to boost (BOOST) circuit, but Be, because the diode in the rectifier bridge in this circuit has fixed pressure drop, cause loss it is larger, the efficiency of circuit cannot expire Foot is required.

In order to overcome the problems referred to above, another kind of power factor correcting of the prior art to adopt without the double boostings of bridge (BOOST) circuit, but, it is in cost and spatially not dominant because this circuit is needed using 2 sets of booster circuits.And And, the switching tube in this circuit remains hard open-minded, and improved efficiency is limited.

At present, used in also a kind of power factor correcting it is totem-pote circuit.The unit that totem-pote circuit is used Part is less, is easy to improve power density.And, the switching tube in this circuit is soft open-minded so that efficiency can be carried further Rise, so as to be conducive to improving overall efficiency.Previous totem-pote circuit adopts conventional metal-oxide-semiconductor, due to the body of conventional metal-oxide-semiconductor The Reverse recovery effect of diode so that totem-pote circuit is typically only capable to be operated in discontinuous mode, control strategy compared with For complexity.And the metal-oxide-semiconductor for being based on GaN material opens speed quickly, and Reverse recovery effect is especially little, therefore, using GaN materials The metal-oxide-semiconductor of material, totem-pote circuit can be operated in inductor current continuous mode, more easily realize.

With reference to Fig. 1, Fig. 1 shows a kind of totem-pote circuit in prior art, including:Inductance L, the first bridge arm 11, second Bridge arm 12 and output capacitance C.Wherein, the first bridge arm 11 includes switching tube Q1 and switching tube Q2, and the two connects in the first junction point A Connect;Second bridge arm 12 includes switching tube Q3 and switching tube Q4, and the two connects in the second junction point B.Still further, switching tube Q1 and Q2 is supervisor, generally can select based on the metal-oxide-semiconductor of GaN material, for controlling the discharge and recharge of whole totem-pote circuit;Open Close pipe Q3 and Q4 to be respectively turned in the positive and negative half cycle of AC-input voltage AC, for synchronous rectification.

The course of work of totem-pote circuit shown in Fig. 2 is simply introduced below with reference to Fig. 2A to Fig. 2 F.With reference to Fig. 2A, When ac input signal AC is in positive half cycle, switching tube Q2 and Q4 conducting, switching tube Q1 and Q3 shut-off, ac input signal AC It is applied on inductance L so that the inductive current for flowing through inductance L rises;With reference to Fig. 2 B, subsequent switching tube Q2 shut-offs, due to existing Dead Time, switching tube Q1 is not yet turned on, and inductive current cannot be mutated, therefore the body diode stream that electric current passes through switching tube Q1 To output capacitance C;With reference to Fig. 2 C, after Dead Time terminates, switching tube Q1 is soft open-minded, inductance L electric discharges, under inductive current starts Drop;When ac input signal AC is in negative half period, corresponding equivalent circuit is similar with positive half cycle as shown in Fig. 2 D to Fig. 2 F, The switching tube for being only intended to charging and discharging is exchanged, and synchronous rectifier has changed switching tube Q3 into by switching tube Q4.

In order to be controlled to the switching tube in totem-pote circuit, notification number is public in the patent documentation of CN101707441B A kind of control program is opened, two current sampling units have been increased in the first bridge arm being connected with inductance, using two electric currents The electric current of sampling unit collection controls respectively the turn-on and turn-off of two switching tubes in the first bridge arm.But in this scheme, One of current sampling unit is floating connection, namely the current sampling unit is connected with ground without conductor so that this circuit is easy Affected by parasitic parameter, and increased the inductive interference to analog circuit;And, in order to ensure higher precision, electric current is adopted Sample unit is generally required using with larger perception, the device of capacitive, be which results in current sampling unit and is enough to produce impact The parasitic parameter of circuit operational effect.

The patent documentation of Publication No. US2012/0293141A1 discloses the control of another kind of totem-pote circuit breaker in middle pipe Scheme processed.Specifically, the program is detected electric current using current transformer and then is used for controlling switch pipe.But, electric current is mutual Sensor still can be introduced may produce the parasitic parameter for affecting to circuit.Specifically, current transformer can introduce stray inductance, Switching tube may produce very big due to voltage spikes in turn-on and turn-off moment, in stray inductance, may cause the system cannot Normal work.

The content of the invention

Present invention solves the technical problem that being to provide a kind of power factor correcting and its control method and electronics sets It is standby, impact of the parasitic parameter to circuit can be reduced.

To solve above-mentioned technical problem, the embodiment of the present invention provides a kind of power factor correcting, including:First input End and the second input, are configured to receive ac input signal, and the ac input signal includes alternate positive half cycle and negative half Week;Outfan, is configured to provide output signal to load;Inductance, its first end couples the first input end;First bridge arm, Its first end couples the outfan, and its second end is directly or indirectly grounded, and first bridge arm includes that the first of series connection opens The first junction point for closing device and second switch device, the first switch device and the connection of second switch device couples the electricity Second end of sense;Second bridge arm, its first end couples the outfan, and its second end is directly or indirectly grounded, and described second Bridge arm includes the 3rd switching device and the 4th switching device of series connection, the 3rd switching device and the connection of the 4th switching device Second junction point couples second input;First current sampling unit, its at least one end is grounded, first current sample Unit be configured at least the ac input signal negative half period sampling flow through the inductance inductive current trailing edge, with Obtain sampled result;Switch control unit, couples first current sampling unit, first switch device and second switch device Part, the switch control unit is configured to produce switch controlling signal according to the sampled result, to control the first switch Device and second switch device alternation switch state.

According to one embodiment of present invention, the second end connection of the second end of first bridge arm and second bridge arm In the 3rd junction point, the outfan couples the first end of output capacitance, and the second end of the output capacitance or the described 3rd connect Contact is grounded, and the sampled point of first current sampling unit is arranged at the second end of the output capacitance and the 3rd connection Between point, first current sampling unit is also sampled the decline of the inductive current in the positive half cycle of the ac input signal Edge.

According to one embodiment of present invention, first bridge arm also includes:Second current sampling unit, its test point sets It is placed between first junction point and the outfan, second current sampling unit is configured to detection and flows through described first The electric current of switching device;Wherein, the switch control unit is also coupled to second current sampling unit, when second electric current When sampling unit detects the electric current for flowing through the first switch device more than default first threshold, the switch control unit The switch controlling signal of generation controls the first switch device shut-off at least Preset Time.

According to one embodiment of present invention, second current sampling unit is the current sampling unit without perception.

According to one embodiment of present invention, first bridge arm also includes:3rd current sampling unit, its test point sets It is placed between first junction point and the 3rd junction point, the 3rd current sampling unit is configured to detection and flows through described second The electric current of switching device;Wherein, the switch control unit is also coupled to the 3rd current sampling unit, when the 3rd electric current When sampling unit detects the electric current for flowing through the second switch device more than default Second Threshold, the switch control unit The switch controlling signal of generation controls the second switch device shut-off at least Preset Time.

According to one embodiment of present invention, the sampled point of first current sampling unit is arranged at first bridge arm The second end and the second end of second bridge arm between, the second end of the second end of first bridge arm or second bridge arm Ground connection.

According to one embodiment of present invention, in the positive half cycle of the ac input signal, the first current sample list Unit's detection flows through the electric current of the second switch device, and when first current sampling unit is detected the second switch is flowed through When the electric current of device exceedes default three threshold value, the switch controlling signal control described second that the switch control unit is produced Switching device shut-off at least Preset Time.

According to one embodiment of present invention, first bridge arm also includes:Second current sampling unit, its test point sets It is placed between first junction point and the outfan, second current sampling unit is configured to detection and flows through described first The electric current of switching device;Wherein, the switch control unit is also coupled to second current sampling unit, when second electric current When sampling unit detects the electric current for flowing through the first switch device more than default four threshold value, the switch control unit The switch controlling signal of generation controls the first switch device shut-off at least Preset Time.

According to one embodiment of present invention, second current sampling unit is the current sampling unit without perception.

According to one embodiment of present invention, when first current sampling unit is detected under the inductive current starts During drop, time point sampling of the switch control unit after Preset Time obtains the sampled result, according to the sampling knot Fruit calculates the time point of the first switch device and second switch device change next time state, and produces the on-off control letter Number controlling the first switch device and second switch device in the time point alternation switch state.

In order to solve the above problems, the embodiment of the present invention also provides a kind of electronic equipment, including any of the above-described kind of power because Number correcting unit.

In order to solve the above problems, the embodiment of the present invention also provides a kind of control method of power factor correcting, institute Stating power factor correcting includes:First input end and the second input, are configured to receive ac input signal, the exchange Input signal includes alternate positive half cycle and negative half period;Outfan, is configured to provide output signal to load;Inductance, it first The end coupling first input end;First bridge arm, its first end couples the outfan, and its second end directly or indirectly connects Ground, first bridge arm includes the first switch device and second switch device of series connection, and the first switch device and second is opened The first junction point for closing device connection couples the second end of the inductance;Second bridge arm, its first end couples the outfan, its Second end is directly or indirectly grounded, and second bridge arm includes the 3rd switching device and the 4th switching device of series connection, described 3rd switching device and the second junction point of the 4th switching device connection couple second input;The control method bag Include:Negative half period sampling at least in the ac input signal flows through the trailing edge of the inductive current of the inductance, to be adopted Sample result;Switch controlling signal is produced according to the sampled result, to control the first switch device and second switch device Alternation switch state.

Compared with prior art, the technical scheme of the embodiment of the present invention has the advantages that:

In the power factor correcting of the embodiment of the present invention, using the first current sampling unit of at least one end ground connection, First current sampling unit is at least tied in the trailing edge of the negative half period sampling inductive current of ac input signal with obtaining sampling Really, and according to the sampled result turn-on and turn-off of the first and second switching devices in the first bridge arm are controlled.Wherein, it is being used for Generate switch controlling signal sampled result in, be additionally may included in ac input signal positive half cycle sampling inductive current it is upper Rise the result that edge or trailing edge are obtained.Due to the first current sampling unit ground connection, therefore, compared to the ground that ground is floated in prior art Current potential because changing caused by parasitic parameter, stablize in the embodiment of the present invention, can't shadow by the ground potential of the first current sampling unit The operational effect of the whole circuit of sound, and improve the stability under high pressure conditions.

Furthermore, the second end of the first bridge arm can be connected to the 3rd junction point with the second end of the second bridge arm, defeated Go out the second end or the 3rd junction point ground connection of electric capacity, the sampled point of the first current sampling unit can be arranged at the of output capacitance Between two ends and the 3rd junction point, thus, the first current sampling unit can be in the positive half cycle of ac input signal and negative half period The sampled result that the trailing edge of sampling inductive current, positive half cycle and negative half period sampling are obtained may be used to generate the first He of control The switch controlling signal of second switch device.

Or, the sampled point of the first current sampling unit can be arranged at the second end of the first bridge arm and the of the second bridge arm Between two ends, the second end of the first bridge arm or the second end of the second bridge arm are grounded.Thus, negative the half of ac input signal Week, the trailing edge of the first current sampling unit sampling inductive current, sampled result is used to generate the first and second derailing switches of control The switch controlling signal of part;And in the positive half cycle of ac input signal, the first current sampling unit can detect that flowing through second opens The electric current of device is closed, testing result can be used for protectively turning off second switch device.

Description of the drawings

Fig. 1 is a kind of electrical block diagram of totem-pote circuit in prior art;

Fig. 2A to Fig. 2 F is equivalent circuit diagram of the totem-pote circuit shown in Fig. 1 under various different working conditions;

Fig. 3 is the electrical block diagram of power factor correcting according to a first embodiment of the present invention;

Fig. 4 A are equivalent circuit diagram of the power factor correcting shown in Fig. 3 in the positive half cycle of ac input signal;

Fig. 4 B are equivalent circuit diagram of the power factor correcting shown in Fig. 3 in the negative half period of ac input signal;

Fig. 5 is the working signal oscillogram of power factor correcting shown in Fig. 3;

Fig. 6 is the electrical block diagram of power factor correcting according to a second embodiment of the present invention;

Fig. 7 is the electrical block diagram of power factor correcting according to a third embodiment of the present invention;

Fig. 8 is the electrical block diagram of power factor correcting according to a fourth embodiment of the present invention;

Fig. 9 A are equivalent circuit diagram of the power factor correcting shown in Fig. 8 in the positive half cycle of ac input signal;

Fig. 9 B are equivalent circuit diagram of the power factor correcting shown in Fig. 8 in the negative half period of ac input signal;

Figure 10 is the electrical block diagram of power factor correcting according to a fifth embodiment of the present invention;

Figure 11 is the structured flowchart of electronic equipment according to a sixth embodiment of the present invention.

Specific embodiment

It is understandable to enable above-mentioned purpose of the invention, feature and beneficial effect to become apparent from, below in conjunction with the accompanying drawings to this The specific embodiment of invention is described in detail.

First embodiment

With reference to Fig. 3, Fig. 3 shows the power factor protection device according to first embodiment, and the device is employed based on figure The structure of post circuit is risen, mainly including first input end, the second input, outfan Out, inductance L, the first bridge arm 31, second Bridge arm 32, the first current sampling unit 301 and switch control unit 30.

Wherein, first input end and the second input are configured to receive ac input signal AC, ac input signal AC bags Include alternate positive half cycle and negative half period.For example, ac input signal AC can be city's signal of telecommunication of amplitude 220V, frequency 50Hz. Outfan Out is configured to provide output signal to load (not shown).The first end coupling first input end of inductance L.

The first end coupling outfan Out of the first bridge arm 31, the second end of its second end and the second bridge arm 32 is connected to the Three junction point D.First bridge arm 31 include the first switch device Q1 and second switch device Q2, first switch device Q1 of series connection and First junction point A of second switch device Q2 connections couples second end of inductance L.First switch device Q1 and second switch device Q2 can be metal-oxide-semiconductor, be preferably based on the metal-oxide-semiconductor of GaN material.

The first end coupling outfan Out of the second bridge arm 32, the second end of its second end and the first bridge arm 31 is connected to the Three junction point D.Second bridge arm 32 include the 3rd switching device Q3 and the 4th switching device Q4, the 3rd switching device Q3 of series connection and Second junction point B of the 4th switching device Q4 connections couples the second input.3rd switching device Q3 and the 4th switching device Q4 Can be metal-oxide-semiconductor, or can also be diode.In the embodiment shown in fig. 3, the 3rd switching device Q3 and the 4th derailing switch Part Q4 is metal-oxide-semiconductor.

At least one end ground connection of the first current sampling unit 301.First current sampling unit 301 is configured in exchange input The positive half cycle of signal AC and negative half period sampling flow through the trailing edge of the inductive current of inductance L, to obtain sampled result, the sampling knot Fruit is transmitted to switch control unit 30.More specifically, the sampled point of the first current sampling unit 301 is arranged at the 3rd junction point And the second end of output capacitance C between, the first end of output capacitance C coupling outfan Out, output capacitance C be configurable to Load is in parallel.

The second end ground connection of the 3rd junction point D or output capacitance C, for example, be grounded via conductor or resistive elements.It is non- Restrictively, in the embodiment shown in Fig. 3, the second end ground connection of output capacitance C, so that load is directly grounded, so that Must load can receive stable output signal.

It should be noted that the connected mode of the first current sampling unit 301 is only illustrated in Fig. 3, its concrete connection side Formula can be different according to the concrete device difference for adopting.For example, the first current sampling unit 301 can be sampling resistor, adopt The first end of sample resistance connects the 3rd junction point D, and the second end of sampling resistor connects the second end of output capacitance C, sampling resistor First end be connected to switch control unit 30 as the outfan of sampled result.Or, the first current sampling unit 301 also may be used To be current transformer, the primary side winding of current transformer is series between the 3rd junction point D and the second end of output capacitance C, The first end of the vice-side winding coupled with primary side winding in current transformer is connected to preset potential (being for example grounded), vice-side winding The second end be connected to switch control unit 30 as the outfan of sampled result.

Switch control unit 30 couples the first current sampling unit 301, first switch device Q1 and second switch device Q2. Switch control unit 30 is configured to produce switch controlling signal according to the sampled result of the first current sampling unit 301, to control First switch device Q1 and second switch device Q2 alternation switch states.More specifically, what switch control unit 30 was produced opens Pass control signal can control first switch device Q1 and second switch device Q2 switches between conducting state and off state. Additionally, switch control unit 30 can also in the lump control the on off state of the 3rd switching device Q3 and the 4th switching device Q4.Open Closing control unit 30 can be realized using various special or universal circuit, and for example, switch control unit 30 can be using numeral letter Number processor (DSP) is realized.

The course of work of power factor correcting shown in Fig. 3 is illustrated below with reference to Fig. 4 A and Fig. 4 B.In order to more Plus it is clear, equivalent circuit is concisely shown, eliminate in Fig. 4 A and Fig. 4 B switch control unit, shut-off switching device and connect Place.

With reference to Fig. 4 A, in the electric current trailing edge of the positive half cycle of ac input signal AC, first switch device Q1 and the 4th is opened Device Q4 conductings are closed, other switching device shut-offs.Electric current from first input end flow out, via inductance L, first switch device Q1, Output capacitance C, the first current sampling unit 301 and the 4th switching device Q4 return the second input.This process is inductance L Discharge process, the first current sampling unit 301 can sample the trailing edge of inductive current.

With reference to Fig. 4 B, in the electric current trailing edge of the negative half period of ac input signal AC, second switch device Q2 and the 3rd is opened Device Q3 conductings are closed, other switching device shut-offs.Electric current flows out from the second input, via the 3rd switching device Q3, output electricity Hold C, the first current sampling unit 301, second switch device Q2 and inductance L and return first input end.This process is also inductance L Discharge process, the first current sampling unit 301 can sample the trailing edge of inductive current.

By upper, with reference to Fig. 3, Fig. 4 A and Fig. 4 B, in the positive half cycle and negative half period of ac input signal AC, the first current sample Unit 301 can sample the trailing edge of inductive current, and the sampled result that sampling is obtained is transmitted to switch control unit 30, To the switch controlling signal for generating control first switch device Q1 and second switch device Q2.First current sampling unit 301 The trailing edge of sampling inductive current, at least one end ground connection of the first current sampling unit 301, compared to the connected mode on floating ground, Impact that can be by parasitic parameter to circuit is minimized.Thus, the first current sampling unit 301 can be using perception, capacitive Larger high precision component is not perplexed with improving sampling precision by parasitic parameter.

Additionally, according to Fig. 4 A and Fig. 4 B, in the positive half cycle and negative half period of ac input signal AC, flowing through the first current sample The sense of current of unit 301 is identical, and its measurement range is 0 to current peak, therefore can be with the shorter electric current of selected range Sampling device, is conducive to improving precision.

Referring still to Fig. 3, switch control unit 30 can be switched with being generated based on sampled result using various appropriate modes Control signal.For example, when the first current sampling unit 301 detects inductive current and begins to decline, switch control unit 30 is pre- If the trailing edge of the time point sampling inductive current after the time, to obtain sampled result;And then calculate first according to sampled result The time point of switching device Q1 and second switch device Q2 change states next time, and produce switch controlling signal and opened with controlling first Device Q1 and second switch device Q2 is closed in corresponding time point alternation switch state.Wherein, the time point after Preset Time can To be preferably the midpoint of the trailing edge of inductive current or near midpoint.Positive half cycle for ac input signal AC and negative half In week, the Preset Time for obtaining sampling time point can be with difference.

With reference to Fig. 3 and Fig. 5, used as a nonrestrictive example, switch control unit 30 can be believed using pulsewidth modulation Number mode controlling first switch device Q1 and second switch device Q2.Specifically, using the pulsewidth modulation that waveform is complementary Signal PWM1 and pulse-width signal PWM2 control respectively first switch device Q1 and second switch device Q2.Pulse-width signal The generation of PWM1 and pulse-width signal PWM2 can be realized based on the count value of PWM enumerators (PWM COUNTER).Fig. 5 In, PWM COUNTER represent the count value of PWM enumerators, and PWM1 represents that pulse-width signal PWM1, PWM2 represent pulsewidth modulation Signal PWM2, IL represent the inductive current for flowing through inductance.

Specifically, PWM enumerators can be operated in continuous increase and decrease pattern, when count value is in increase and equal to preset value During CMPA, pulse-width signal PWM1 is put high (for example, logical one), and when count value reduces and during equal to preset value CMPA, Pulse-width signal PWM1 is set low (for example, logical zero).Correspondingly, pulse-width signal PWM1 being negated can obtain arteries and veins Wide modulated signal PWM2.In the positive half cycle of ac input signal AC, can be when the count value of PWM enumerators be equal to 0 (such as when Carve t1) the first current sampling unit 301 is triggered to inductive current IL samplings;And in the negative half period of ac input signal AC, can be with When the count value of PWM enumerators is equal to periodic quantity, (such as moment t2) triggers the first current sampling unit 301 to inductive current IL samples.Further, since needing multiple data of sampling within the counting cycle of each PWM enumerator, there is certain sampling and prolong When, and first switch device Q1 and second switch device Q2 shut-off the moment there may be waveform concussion cause sampling error, It is necessary to ensure that sampled point has a reasonable time to the shut-off moment poor, therefore, the dutycycle of pulse-width signal PWM1 and PWM2 90% can be less than.

Second embodiment

With reference to Fig. 6, Fig. 6 shows the power factor correcting according to second embodiment, its structure and shown in Fig. 3 first Embodiment is essentially identical, differs primarily in that, the first bridge arm 31 also includes the second current sampling unit 302.

Furthermore, the test point of the second current sampling unit 302 be arranged at the first junction point A and outfan Out it Between, the second current sampling unit 302 is configured to detect the electric current for flowing through first switch device Q1.Although in the example shown in Fig. 6, The test point of the second current sampling unit 302 is arranged between outfan Out and first switch device Q1, but alternatively, the The test point of two current sampling units 302 can also be arranged between first switch device Q1 and the first junction point A.

Second current sampling unit 302 couples switch control unit 30, to put it more simply, Fig. 6 does not show that the second electric current is adopted The annexation of sample unit 302 and switch control unit 30.First switch device is flowed through when the second current sampling unit 302 is detected When the electric current of part Q1 exceedes default first threshold, the switch controlling signal control first switch device that switch control unit 30 is produced Part Q1 shut-offs at least Preset Time.Adopt in such a way, it is possible to achieve the overcurrent protection to first switch device Q1, keep away as far as possible Exempt from the damage of first switch device Q1.

Second current sampling unit 302 is mainly used in overcurrent protection or overcurrent monitoring, and the requirement of its precision is not high.With One current sampling unit 301 is similar to, and the second current sampling unit 302 can also be various appropriate current sampling units, for example Sampling resistor or sampling A/D chip etc..Preferably, the second current sampling unit 302 can be the current sampling unit of noninductive property, Such as in the prior art various appropriate current sample chips without perceptual or low perception.Due to the second current sampling unit 302 It is floating connection, therefore, parasitic parameter can as far as possible be reduced using the current sampling unit without perceptual or low perception, posted with reducing Impact of the raw parameter to circuit.

3rd embodiment

With reference to Fig. 7, Fig. 7 shows the power factor correcting according to 3rd embodiment, its structure and shown in Fig. 6 second Embodiment is essentially identical, differs primarily in that, the first bridge arm 31 also includes the 3rd current sampling unit 303.

Furthermore, the test point of the 3rd current sampling unit 303 is arranged at the first junction point A and the 3rd junction point D Between, the 3rd current sampling unit 303 is configured to detect the electric current for flowing through second switch device Q2.Preferably, the 3rd electric current is adopted The test point of sample unit 303 is arranged between second switch device Q2 and the 3rd junction point D, thus the 3rd current sampling unit 303 can be directly grounded or indirect earthed via the first current sampling unit 301 by the 3rd junction point D, compared to floating Connected mode, impact of the parasitic parameter of the 3rd current sampling unit 303 to circuit can be reduced.Without limitation, in Fig. 7 In shown embodiment, the second end ground connection of output capacitance C, the 3rd current sampling unit is via the first current sampling unit 301 It is grounded indirectly.

3rd current sampling unit 303 couples switch control unit 30, to put it more simply, Fig. 7 does not show that the 3rd electric current is adopted The annexation of sample unit 303 and switch control unit 30.Second switch device is flowed through when the 3rd current sampling unit 303 is detected When the electric current of part Q2 exceedes default Second Threshold, the switch controlling signal control second switch device that switch control unit 30 is produced Part Q2 shut-offs at least Preset Time.Using such scheme, it is possible to achieve the overcurrent protection to second switch device Q2, keep away as far as possible Exempt from the damage of second switch device Q2.

It should be noted that in the example shown in Fig. 7, using the second current sampling unit 302 and the 3rd current sample list Unit 303 carries out respectively overcurrent protection to first switch device Q1 and second switch device Q2, but alternatively, Overcurrent protection can be carried out to second switch device Q2 only with the 3rd current sampling unit 303, and omit the second current sample Unit 302, to simplify circuit structure.

Fourth embodiment

With reference to Fig. 8, Fig. 8 shows the power factor protection device according to fourth embodiment, its structure and shown in Fig. 1 first Embodiment is essentially identical, differs primarily in that, the sampled point of the first current sampling unit 301 is arranged at the second of the first bridge arm 31 Between end and the second end of the second bridge arm 32.The different of earth point are also resided in from the main distinction of first embodiment, specifically, The second end ground connection of the second end of the first bridge arm 31 or the second bridge arm 32.In the embodiment shown in fig. 8, the of the second bridge arm 32 Two ends are connected to the second end of output capacitance C and are grounded, so that load is directly grounded, so that load can be received Stable output signal.

The connected mode of the first current sampling unit 301 in Fig. 8 is also simply illustrated, and its concrete connected mode can basis The concrete device for adopting is different and different.For example, the first current sampling unit 301 can be sampling resistor, the of sampling resistor One end connects the second end of the first bridge arm 31, and the second end of sampling resistor connects the second end of the second bridge arm 32, sampling resistor First end is connected to switch control unit 30 as the outfan of sampled result.Or, the first current sampling unit 301 can also It is current transformer, the primary side winding of current transformer is series at the first end of the first bridge arm 31 and the second end of the second bridge arm 32 Between, the first end of the vice-side winding of current transformer is connected to preset potential (being for example grounded), and the second end of vice-side winding is made Outfan for sampled result is connected to switch control unit 30.

Similar with first embodiment, in the fourth embodiment, the first current sampling unit 301 is in the negative of ac input signal The trailing edge of half cycle sampling inductive current, and switch controlling signal is generated according to sampled result.First current sampling unit 301 At least one end is grounded, and compared to the connected mode on floating ground, impact that can be by parasitic parameter to circuit is minimized.Thus, One current sampling unit 301 can adopt the larger high precision component of perception, capacitive to improve sampling precision, and not joined by parasitism Several puzzlements.

In the negative half period of ac input signal AC, the first current sampling unit 301 can enter to the trailing edge of inductive current Row sampling, the sampled result for obtaining can be provided to switch control unit 30, to generate switch controlling signal;And in exchange input The positive half cycle of signal AC, the first current sampling unit 301 can detect the electric current for flowing through second switch device Q2, the detection for obtaining As a result can provide to switch control unit 30, when detect flow through second switch device Q2 electric current exceed default 3rd threshold During value, the control second switch device Q2 of switch control unit 30 shut-offs at least Preset Time, to realize overcurrent protection.Using this reality The scheme of example is applied, the spike electricity in the patent documentation of Publication No. US2012/0293141A1 that background technology is mentioned can be solved Flow problem.

It is described in detail below with reference to Fig. 9 A and Fig. 9 B.In order to it is clearer, equivalent circuit is concisely shown, Fig. 9 A and Switch control unit, the switching device of shut-off and earth point are eliminated in Fig. 9 B.

With reference first to Fig. 9 A, in the rise-time of current of the positive half cycle of ac input signal AC, electric current is from first input end stream Go out, return second via inductance L, second switch device Q2, the first current sampling unit 301 and the 4th switching device Q4 and be input into End, thus, the first current sampling unit 301 can detect the electric current for flowing through second switch device Q2, and testing result is transmitted to opening Close control unit to realize the overcurrent protection to second switch device Q2.In addition, flowing through the electric current of second switch device Q2 simultaneously Also inductance L is flowed through, therefore, in the positive half cycle of ac input signal AC, the first current sampling unit 301 can also be to flowing through inductance The inductive current of L is sampled, and for example, the rising edge of the electric current for flowing through inductance L during to the positive half cycle of ac input signal AC enters Row sampling, sampled result can be transmitted to switch control unit, for generating control first switch device Q1 and second switch The switch controlling signal of device Q2.With reference to Fig. 9 B, in the electric current trailing edge of the negative half period of ac input signal AC, electric current is from second Input flow out, via the 3rd switching device Q3, output capacitance C, the first current sampling unit 301, second switch device Q2 and Inductance L returns first input end.This process is the discharge process of inductance L, and the first current sampling unit 301 can sample inductance electricity The trailing edge of stream, sampled result can be transmitted to switch control unit, for generating switch controlling signal.

Additionally, according to Fig. 9 A and Fig. 9 B, in the rise-time of current and the electricity of negative half period of the positive half cycle of ac input signal AC Stream trailing edge, the sense of current for flowing through the first current sampling unit 301 is contrary, and its measurement range is 2 times of current peak, Therefore in this embodiment, the first current sampling unit 301 needs the relatively long current sampling devices of selected range.

5th embodiment

With reference to Figure 10, Figure 10 shows the power factor correcting according to the 5th embodiment, the shown in its structure and Fig. 8 Four embodiments are essentially identical, differ primarily in that, the first bridge arm 31 also includes the second current sampling unit 302.

Furthermore, the test point of the second current sampling unit 302 be arranged at the first junction point A and outfan Out it Between, the second current sampling unit 302 is configured to detect the electric current for flowing through first switch device Q1.Although the example shown in Figure 10 In, the test point of the second current sampling unit 302 is arranged between outfan Out and first switch device Q1, but alternatively, The test point of the second current sampling unit 302 can also be arranged between first switch device Q1 and the first junction point A.

Second current sampling unit 302 couples switch control unit 30, to put it more simply, Figure 10 does not show that the second electric current is adopted The annexation of sample unit 302 and switch control unit 30.First switch device is flowed through when the second current sampling unit 302 is detected When the electric current of part Q1 exceedes default four threshold value, the switch controlling signal control first switch device that switch control unit 30 is produced Part Q1 shut-offs at least Preset Time.Adopt in such a way, it is possible to achieve the overcurrent protection to first switch device Q1, with as far as possible Avoid the damage of first switch device Q1.

Preferably, the second current sampling unit 302 can be the current sampling unit of noninductive property.Due to the second current sample Unit 302 is floating connection, therefore, parasitic parameter can as far as possible be reduced using the current sampling unit without perception, posted with reducing Impact of the raw parameter to circuit.

Sixth embodiment

With reference to Figure 11, Figure 11 shows the structured flowchart of the electronic equipment according to sixth embodiment, mainly includes comprising figure Rise main circuit 111, rear class resonance circuit (LLC) 112 and the DSP panels 110 of post circuit.Wherein, DSP panels 110 to The switch control unit in the above-mentioned first to the 5th embodiment is realized, and main circuit 111 can be beyond switch control unit Other circuit structures.Therefore, the electronic equipment of sixth embodiment includes the power factor school in the above-mentioned first to the 5th embodiment Equipment and rear class resonance circuit 112.Thus, ac input signal AC carries out power factor via power factor correcting After correction, to drive rear class resonance circuit 112.

Used as a nonrestrictive example, DSP panels 110 can be based on the chip reality of model TMS320F28027 Existing, it has the spies such as low cost, operation dominant frequency height, little AD sampling time delays, AD samplings and pwm signal generating mode flexible configuration Point, can relatively easily meet the demand of the above-mentioned first to the 5th embodiment.After powering, can first to the DSP controls Plate 110 carries out system configuration, such as including clock selecting, terminal control, RAM Code copyings, FLASH configurations etc.;Then it is right again The peripheral hardware that uses of needs is configured respectively, after the completion for the treatment of all of initialization operation, it is possible to into endless loop to wait in Disconnected triggering, the control algolithm of totem-pote circuit is performed into TCP, namely generates switch controlling signal.

Still further, on the one hand the process of the generation of DSP panels 110 switch controlling signal can be based on to inductance electricity The sampled result of the trailing edge of stream, the voltage for being on the other hand also based on the output signal of ac input signal and outfan is adopted Sample result.In other words, the process of switch controlling signal can adopt double -loop control, internal ring electric current loop that the electric current of outfan is protected The input voltage identical sinusoidal wave form with ac input signal is held, while reducing phase contrast as far as possible;And outer shroud Voltage loop is caused The voltage of outfan remains stable, while being provided to the output of outfan according to the change adjustment of ac input signal and load The virtual value of electric current.

It should be noted that be only a kind of nonrestrictive example shown in Figure 11, shown in the above-mentioned first to the 5th embodiment Power factor correcting can be used for needing in any appropriate electronic equipment for carry out PFC.

7th embodiment

7th embodiment is related to a kind of control method of power factor correcting, and the power factor correcting can join Fig. 1 is examined, including:First input end and the second input, are configured to receive ac input signal AC, and ac input signal AC includes Alternate positive half cycle and negative half period;Outfan, is configured to provide output signal to load;Inductance L, its first end coupling first is defeated Enter end;First bridge arm 11, its first end couples above-mentioned outfan, and its second end is directly or indirectly grounded, and the first bridge arm 11 is wrapped Include series connection first switch device Q1 and second switch device Q2, first switch device Q1 and second switch device Q2 connection the One junction point A couples second end of inductance L;Second bridge arm 12, its first end coupling outfan, its second end is directly or indirectly Ground connection, the second bridge arm 12 includes the 3rd switching device Q3 and the 4th switching device Q4, the 3rd switching device Q3 and the 4th of series connection Second junction point B of switching device Q4 connections couples the second input.The control method can include:At least in exchange input letter The negative half period sampling of number AC flows through the trailing edge of the inductive current of inductance L, to obtain sampled result;Produced according to sampled result and opened Control signal is closed, to control first switch device Q1 and second switch device Q2 alternation switch states.

In the first change case, the second end of the first bridge arm 11 is connected to the 3rd and is connected with the second end of the second bridge arm 12 Point, outfan couples the first end of output capacitance C, and the second end of output capacitance C or the 3rd junction point are grounded.Sampled point is set It is placed between the second end of output capacitance C and the 3rd junction point, with the negative half period of ac input signal AC sampling inductive current Trailing edge.Additionally, the sampled point can be also used for the trailing edge of the positive half cycle sampling inductive current in ac input signal AC, The sampled result of positive half cycle and negative half period may be used to produce switch controlling signal.Such example be referred to Fig. 3 and its Associated description.

More specifically, when detecting inductive current and beginning to decline, the time point sampling after Preset Time is adopted Sample result, according to sampled result the time point of first switch device Q1 and second switch device Q2 change next time states is calculated, and Produce switch controlling signal to control first switch device Q1 and second switch device Q2 in the time point alternation switch state.Open The generation process for closing control signal is referred to Fig. 5 and its associated description.

In the second change case based on above-mentioned first change case, can be between the first junction point A and outfan Detection on path flows through the electric current of first switch device Q1, when detect the electric current that flows through first switch device Q1 exceed it is default During first threshold, the switch controlling signal control first switch device Q1 shut-offs at least Preset Time of generation, with to first switch Device Q1 carries out overcurrent protection.Such example is referred to Fig. 6 and its associated description.

In the 3rd change case based on the above-mentioned first or second change case, can be with the companies of the first junction point A and the 3rd Detection on path between contact flows through the electric current of second switch device Q2, when the electric current for flowing through second switch device Q2 exceedes in advance If Second Threshold when, the switch controlling signal control second switch device Q2 shut-offs at least Preset Time of generation, with to second Switching device Q2 carries out overcurrent protection.Such example is referred to Fig. 7 and its associated description.

In the 4th change case, the sampled point of the trailing edge of inductive current is arranged at second end and second of the first bridge arm 11 Between second end of bridge arm 12, the second end ground connection of the second end of the first bridge arm 11 or the second bridge arm 32.The sampled point can be with In the trailing edge of the negative half period sampling inductive current of ac input signal AC.And in the positive half cycle of ac input signal AC, at this Sampled point can also detect the electric current for flowing through second switch device Q2, exceed when the electric current that flows through second switch device Q2 is detected During default three threshold value, the switch controlling signal control second switch device Q2 shut-offs at least Preset Time of generation, to realize Overcurrent protection to second switch device Q2.Such example may refer to Fig. 8 and its associated description.

In the 5th change case based on the 4th change case, can be with the path between the first junction point A and outfan It is upper to detect the electric current for flowing through first switch device Q1, when the electric current for flowing through first switch device Q1 exceedes default 4th threshold value When, the switch controlling signal control first switch device Q1 shut-offs at least Preset Time of generation, to realize to first switch device The overcurrent protection of Q1.

Although present disclosure is as above, the present invention is not limited to this.Any those skilled in the art, without departing from this In the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute The scope of restriction is defined.

Claims (19)

1. a kind of power factor correcting, it is characterised in that include:
First input end and the second input, are configured to receive ac input signal, and the ac input signal includes alternate Positive half cycle and negative half period;
Outfan, is configured to provide output signal to load;
Inductance, its first end couples the first input end;
First bridge arm, its first end couples the outfan, and its second end is directly or indirectly grounded, and first bridge arm includes First connection of the first switch device and second switch device of series connection, the first switch device and the connection of second switch device Second end of the point coupling inductance;
Second bridge arm, its first end couples the outfan, and its second end is directly or indirectly grounded, and second bridge arm includes Second connection of the 3rd switching device and the 4th switching device of series connection, the 3rd switching device and the connection of the 4th switching device Point coupling second input;
First current sampling unit, its at least one end is grounded, and first current sampling unit is configured at least in the exchange The negative half period sampling of input signal flows through the trailing edge of the inductive current of the inductance, to obtain sampled result;
Switch control unit, couples first current sampling unit, first switch device and second switch device, the switch Control unit is configured to produce switch controlling signal according to the sampled result, is opened with controlling the first switch device and second Close device alternation switch state.
2. power factor correcting according to claim 1, it is characterised in that the second end of first bridge arm and institute The second end for stating the second bridge arm is connected to the 3rd junction point, and the outfan couples the first end of output capacitance, the output electricity The second end for holding or the 3rd junction point ground connection, the sampled point of first current sampling unit is arranged at the output capacitance The second end and the 3rd junction point between, first current sampling unit is also in the positive half cycle of the ac input signal Sample the trailing edge of the inductive current.
3. power factor correcting according to claim 2, it is characterised in that first bridge arm also includes:Second Current sampling unit, its test point is arranged between first junction point and the outfan, the second current sample list Unit is configured to the electric current of first switch device described in detection stream Jing;
Wherein, the switch control unit is also coupled to second current sampling unit, when second current sampling unit inspection When measuring the electric current for flowing through the first switch device more than default first threshold, the switch that the switch control unit is produced Control signal controls the first switch device shut-off at least Preset Time.
4. power factor correcting according to claim 3, it is characterised in that second current sampling unit is nothing The current sampling unit of perception.
5. the power factor correcting according to any one of claim 2 to 4, it is characterised in that first bridge arm Also include:3rd current sampling unit, its test point is arranged between first junction point and the 3rd junction point, and the described 3rd Current sampling unit is configured to detect the electric current for flowing through the second switch device;
Wherein, the switch control unit is also coupled to the 3rd current sampling unit, when the 3rd current sampling unit inspection When measuring the electric current for flowing through the second switch device more than default Second Threshold, the switch that the switch control unit is produced Control signal controls the second switch device shut-off at least Preset Time.
6. power factor correcting according to claim 1, it is characterised in that first current sampling unit is adopted Sampling point is arranged between the second end of the second end of first bridge arm and second bridge arm, the second end of first bridge arm Or the second end ground connection of second bridge arm.
7. power factor correcting according to claim 6, it is characterised in that just the half of the ac input signal Week, the first current sampling unit detection flows through the electric current of the second switch device, when first current sampling unit When detecting the electric current for flowing through the second switch device more than default three threshold value, what the switch control unit was produced opens Close control signal and control the second switch device shut-off at least Preset Time.
8. the power factor correcting according to claim 6 or 7, it is characterised in that first bridge arm also includes:The Two current sampling units, its test point is arranged between first junction point and the outfan, second current sample Unit is configured to detect the electric current for flowing through the first switch device;
Wherein, the switch control unit is also coupled to second current sampling unit, when second current sampling unit inspection When measuring the electric current for flowing through the first switch device more than default four threshold value, the switch that the switch control unit is produced Control signal controls the first switch device shut-off at least Preset Time.
9. power factor correcting according to claim 8, it is characterised in that second current sampling unit is nothing The current sampling unit of perception.
10. power factor correcting according to claim 1, it is characterised in that when first current sampling unit When detecting the inductive current and beginning to decline, time point sampling of the switch control unit after Preset Time obtains described Sampled result, according to the sampled result time of the first switch device and second switch device change next time state is calculated Point, and produce the switch controlling signal and changed in the time point with controlling the first switch device and second switch device On off state.
11. a kind of electronic equipment, it is characterised in that fill including the PFC any one of claim 1 to 10 Put.
A kind of 12. control methods of power factor correcting, the power factor correcting includes:
First input end and the second input, are configured to receive ac input signal, and the ac input signal includes alternate Positive half cycle and negative half period;
Outfan, is configured to provide output signal to load;
Inductance, its first end couples the first input end;
First bridge arm, its first end couples the outfan, and its second end is directly or indirectly grounded, and first bridge arm includes First connection of the first switch device and second switch device of series connection, the first switch device and the connection of second switch device Second end of the point coupling inductance;
Second bridge arm, its first end couples the outfan, and its second end is directly or indirectly grounded, and second bridge arm includes Second connection of the 3rd switching device and the 4th switching device of series connection, the 3rd switching device and the connection of the 4th switching device Point coupling second input;
Characterized in that, the control method includes:
Negative half period sampling at least in the ac input signal flows through the trailing edge of the inductive current of the inductance, to be adopted Sample result;
Switch controlling signal is produced according to the sampled result, to control the first switch device and the change of second switch device On off state.
The control method of 13. power factor correctings according to claim 12, it is characterised in that first bridge arm The second end and the second end of second bridge arm be connected to the 3rd junction point, the first of the outfan coupling output capacitance End, the second end of the output capacitance or the 3rd junction point are grounded, and the sampled point of the trailing edge of the inductive current is arranged Between the second end of the output capacitance and the 3rd junction point, the sampled point is additionally operable in the ac input signal Positive half cycle sample the trailing edge of the inductive current.
The control method of 14. power factor correctings according to claim 13, it is characterised in that also include:
On path between first junction point and the outfan, detection flows through the electric current of the first switch device;
When the electric current for flowing through the first switch device is detected more than default first threshold, the switch controlling signal control Make the first switch device shut-off at least Preset Time.
The control method of 15. power factor correctings according to claim 13 or 14, it is characterised in that also include:
On path between first junction point and the 3rd junction point, detection flows through the electric current of the second switch device;
When the electric current for flowing through the second switch device exceedes default Second Threshold, the switch controlling signal control is described Second switch device shut-off at least Preset Time.
The control method of 16. power factor correctings according to claim 12, it is characterised in that the inductive current The sampled point of trailing edge be arranged between the second end of the second end of first bridge arm and second bridge arm, described first The second end ground connection of the second end of bridge arm or second bridge arm.
The control method of 17. power factor correctings according to claim 16, it is characterised in that defeated in the exchange Enter the positive half cycle of signal, in the sampled point detection electric current of the second switch device is flowed through, when detecting described the is flowed through When the electric current of two switching devices exceedes default three threshold value, the switch controlling signal controls the second switch device shut-off At least Preset Time.
The control method of 18. power factor correctings according to claim 16 or 17, it is characterised in that also include:
On path between first junction point and outfan, detection flows through the electric current of the first switch device;
When the electric current for flowing through the first switch device exceedes default four threshold value, the switch controlling signal control is described First switch device shut-off at least Preset Time.
The control method of 19. power factor correctings according to claim 12, it is characterised in that described when detecting When inductive current begins to decline, the time point sampling after Preset Time obtains the sampled result, according to the sampled result The time point of the first switch device and second switch device change next time state is calculated, and produces the switch controlling signal To control the first switch device and second switch device in the time point alternation switch state.
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CN108696116A (en) * 2018-06-01 2018-10-23 广东美的制冷设备有限公司 Totem pfc circuit, pulse width control method, air conditioner and storage medium
CN108809076A (en) * 2018-06-01 2018-11-13 广东美的制冷设备有限公司 Totem pfc circuit, pulse width control method, air conditioner and storage medium
CN108809074A (en) * 2018-06-01 2018-11-13 广东美的制冷设备有限公司 Totem pfc circuit, pulse control method, air conditioner and storage medium
CN108809075A (en) * 2018-06-01 2018-11-13 广东美的制冷设备有限公司 Totem pfc circuit, pulse width control method, air conditioner and storage medium
CN108809122A (en) * 2018-06-04 2018-11-13 广东美的制冷设备有限公司 Rectification control method, air conditioner and computer readable storage medium
CN108809121A (en) * 2018-06-04 2018-11-13 广东美的制冷设备有限公司 Rectification control method, air conditioner and computer readable storage medium
CN109921676A (en) * 2019-03-04 2019-06-21 易事特集团股份有限公司 Converter topology unit and converter device

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